Home / 20,742.51-28,639.40-12,787.23

Finding the Fourth Proportional to 20,742.51, 28,639.40 and 12,787.23

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Solution

The fourth proportional to 20,742.51, 28,639.40 and 12,787.23 is: 17,655.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,742.51 : 28,639.40 = 12,787.23 : x
  2. Step 2: Convert to fraction form
    20,742.51/28,639.40 = 12,787.23/x
  3. Step 3: Cross multiply
    20,742.51x = 28,639.40 × 12,787.23
  4. Step 4: Simplify right side
    20,742.51x = 366,218,530.93
  5. Step 5: Solve for x
    x = 366,218,530.93/20,742.51
  6. Step 6: Final answer
    x = 17,655.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.